We present UBVI absolute and V-band time-series CCD photometric results for the intermediate-age open cluster NGC 2539.
From the empirical zero-age main sequence and theoretical isochrone fitting in color-color and color-magnitude diagrams,
we estimated the physical parameters of this cluster as follows: the color excess of , the distance modulus of
and the age of (~630 Myr).
By carefully examining the time-series images, we discovered seven new variable stars in the observed cluster field.
Considering the light curves, periods and positions on the color-magnitude diagram, we classified them as five eclipsing
binary stars, one δ Scuti star and one γ Doradus candidate.
The γ Doradus candidate might not be a cluster member because it is located redder by about than
the cool edge of γ Doradus instability strip.

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